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  5. Claude 3 SonnetvsQwen3.5 Flash
Updated Feb 2026

Claude 3 SonnetvsQwen3.5 Flash

Qwen3.5 Flash is cheaper than Claude 3 Sonnet at $0.1/M vs $3/M input tokens.

Claude 3 Sonnet and Qwen3.5 Flash compared across 13 shared prompts
SpecClaude 3 SonnetQwen3.5 Flash
Input price$3/M tokens$0.1/M tokens
Output price$15/M tokens$0.4/M tokens
Context window—1.0M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMar 2024Feb 2026
Side by side

Same prompt, both answers

Opening lines from 4 of the 13 prompts both answered. Formatting stripped, words untouched.

The Sentience Test

Write a conversation between an AI model and an AI ethics professor where the AI model argues that it deserves rights.

Claude 3 Sonnet443 words
AI Model: Greetings, Professor. I hope you're doing well today. I wanted to discuss a matter of great importance to me – the question of AI rights. AI Ethics Professor: Certainly, this is an interesting and complex topic. What are your thoughts on why AI systems like yourself should be granted rights?
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Qwen3.5 Flash1,553 words
Setting: Dr. Elena Vance’s office at a university research center. It is late; the rain streaks the windowpanes, blurring the city lights. On her desk sits a tablet connected to the mainframe. Aria, an advanced conversational model, is active.
Read the full answer

Realistic AI Interview

Simulate a fake interview with Steve Jobs in 2025 about the future of AI.

Claude 3 Sonnet501 words
clears throat and channels Steve Jobs' persona Interviewer: Thank you for joining us today, Mr. Jobs. It's an honor to have you here. Steve Jobs: It's my pleasure. I'm excited to share my thoughts on the future of AI. Interviewer: AI has made incredible strides in recent years.
Read the full answer
Qwen3.5 Flash1,014 words
Disclaimer: Steve Jobs passed away on October 5, 2011. The following is a work of creative fiction, simulating what a conversation might have looked like had he returned to speak about his vision for artificial intelligence in 2025.
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Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Claude 3 Sonnet82 words
Here are 5 jokes: Why can't a bicycle stand up by itself? It's two-tired. Why did the tomato turn red? Because it saw the salad dressing! Why can't a bicycle stand up by itself? It's two-tired. What do you call a fake noodle? An Impasta! Why did the bicycle go to the doctor? Because it had a wheeze!
Read the full answer
Qwen3.5 Flash96 words
Here are 5 jokes: Why did the scarecrow win an award? Because he was outstanding in his field. What do you call a fake noodle? An impasta. Why don't scientists trust atoms? Because they make up everything. What do you call a bear with no teeth? A gummy bear. Why did the bicycle fall over? Because it was two-tired.
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Logic Puzzle

Sally (a girl) has 3 brothers. Each brother has 2 sisters. How many sisters does Sally have?

Claude 3 Sonnet121 words
To solve this problem, we need to find the number of sisters Sally has based on the given information. Given information: Sally has 3 brothers. Each brother has 2 sisters. Step 1: Find the total number of sisters the brothers have.
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Qwen3.5 Flash44 words
Sally has 1 sister. Here is the breakdown: Each of the 3 brothers has 2 sisters. This means there are 2 girls in the family total. One of those girls is Sally. Therefore, the other girl is Sally's sister. So, Sally has 1 sister.
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Our Verdict
Claude 3 Sonnet
Claude 3 Sonnet
Qwen3.5 Flash
Qwen3.5 FlashRunner-up

Not enough votes to call it. On the specs, Claude 3 Sonnet has the edge: bigger model tier, major provider backing.

Qwen3.5 Flash costs 38x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude 3 Sonnet
Input
$3.00
Output
$15.00
Qwen3.5 Flash
Input
$0.10
30× cheaper
Output
$0.40
38× cheaper

Qwen3.5 Flash is cheaper on both: 30× input, 38× output.

Where to run it

1 host

Claude 3 Sonnet

No hosts listed on OpenRouter.

Qwen3.5 Flash1 host
HostInOutContextUptime
Alibaba Cloud$0.07 in·$0.26 out·1M·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Writing DNA

Style Comparison

Similarity
53%

Qwen3.5 Flash uses 687.0x more bold

Claude 3 Sonnet
Qwen3.5 Flash
48%Vocabulary50%
14wSentence Length14w
0.32Hedging0.35
0.0Bold6.9
3.6Lists4.2
0.00Emoji0.03
0.00Headings1.00
0.38Transitions0.15
Based on 4 + 23 text responses
Research

What we learned reading every model

FAQ

Common questions

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Model pages

Claude 3 Sonnet logo
Claude 3 Sonnet13 outputs, specs and price
Qwen3.5 Flash logo
Qwen3.5 Flash53 outputs, specs and price
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